138938730 has 32 divisors (see below), whose sum is σ = 381089664. Its totient is φ = 31757376.

The previous prime is 138938729. The next prime is 138938753. The reversal of 138938730 is 37839831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330597 + ... + 331016.

It is an arithmetic number, because the mean of its divisors is an integer number (11909052).

Almost surely, 2^138938730 is an apocalyptic number.

138938730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138938730 is an abundant number, since it is smaller than the sum of its proper divisors (242150934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138938730 is a wasteful number, since it uses less digits than its factorization.

138938730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661630.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 138938730 is about 11787.2274093614. The cubic root of 138938730 is about 517.9340240853.

The spelling of 138938730 in words is "one hundred thirty-eight million, nine hundred thirty-eight thousand, seven hundred thirty".